Variable-temperature cross-polarization magic-angle spinning solid-state 13C NMR spectra of bisphenol-F diglycidyl ether were obtained in the temperature range 25–67°C. Dynamic phenomena are observed, and the experimental data are in accord with an inhomogeneous distribution of correlation times, perhaps related to a second-order phase change. Single-pulse excitation experiments under comparable conditions confirmed the presence of motional inhomogeneity, characterized by a fraction of mobile molecules within the sample. Differential scanning calorimetric measurements revealed a phase transition at ca. 50 °C.
Variable-Temperature High Resolution Carbon-13 Studies of Molecular Motion in Solid Bisphenol-F Diglycidyl Ether.
CASARINI, Daniele;
1992-01-01
Abstract
Variable-temperature cross-polarization magic-angle spinning solid-state 13C NMR spectra of bisphenol-F diglycidyl ether were obtained in the temperature range 25–67°C. Dynamic phenomena are observed, and the experimental data are in accord with an inhomogeneous distribution of correlation times, perhaps related to a second-order phase change. Single-pulse excitation experiments under comparable conditions confirmed the presence of motional inhomogeneity, characterized by a fraction of mobile molecules within the sample. Differential scanning calorimetric measurements revealed a phase transition at ca. 50 °C.File in questo prodotto:
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